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H . I HYDE ENVIRONM[NTAL, ING Memorandum To: Jim Nitzschke,Deere&Co. cc: Steve Lujan,John Deere From: Bob Thomson Date: October 26, 2009 Subject: Soil Sampling Results Former Parts Depot, Stockton,CA This memo summarizes the methods and results of a Phase II investigation performed by Hyde Environmental,Inc. (Hyde)at the former John Deere Parts Depot facility on September 24,2009. The investigation was performed to evaluate several potential environmental concerns identified in the Phase I Environmental Site Assessment(ESA) report submitted to Deere&Co. in August 2009. A site layout is shown on Figure 1.The investigation included collecting soil samples near a septic drainage field, in disturbed areas along the western property boundary,and from a soil pile on the northwest comer of the property.This memo is intended to assist Deere and Co. with planning,and is not intended for regulatory compliance. The soil samples were analyzed for lists of chemicals typically tested during environmental investigations,and based on observations made during the Phase I ESA. The data were compared to the U.S. Environmental Protection Agency(U.S. EPA)Region 9 Regional Screening Levels(RSLs)for the protection of groundwater(which is generally the most conservative exposure pathway)and for direct exposure at industrial sites. The U.S.EPA Region 9 RSLs are similar to,but not identical to, soil screening levels promulgated by the State of California.The Region 9 RSLs are considered to be for screening purposes only; a detailed site investigation and risk assessment could result in the development of different standards. SEPTIC FIELD Soil samples were collected to evaluate whether contaminants from floor drains or other sources have been released through the septic system. The facility's septic field is located near the northeast comer of the warehouse and three borings were drilled around it (Figure 1). The borings were intentionally drilled outside of the area where the seepage bed is likely to be,to prevent damaging it.The locations were based on a 1956 blue-line print showing the location of the septic field. The borings were drilled to a depth of 8 feet, and soil cores were collected continuously from each boring.Photos and descriptions of the sampling areas are shown in Attachment A.